Any place on your buttocks you can reach works for me with my quicksets. Im not skinny, but I save my tummy for the Dexcom sensors as I don't like them in any other location. For thighs, I am muscular and switched to the angeled sets so it works good where I can pinch a good amount of skin, usually on the top of my thigh as off to the side I get into to much muscle. Call Medtronic, they use to send a sample set of different infusin sets for you to try if needed. Regarding Lathump's problem of snagging sites and yanking them out - I am the queen of that, so I take a 2X2 piece of gauze, cut it in half to make it thinner, and just tape it (the edges) over the site. Works like a charm and have not yanked a site out since. Looks a little funny, but hey - beats losing a site the first day of inserting! good luck!